308 



BULLETIN OF THE BUREAU OF FISHERIES. 



plainest and extending below the lateral line; entire under parts yellowish-white with very fine dark 

 punct illations; fins essentially as in the darker form. 



Cottus cognatus Richardson, Fauna Bor.-Amcr., m, 40, 183G, Great Bear Lake. Giinther, Cat., n, 157, lxoo. Jordan 

 & Evermann. Fishes North and Mid. Arner., pt. II, 1954, 1898. 



130. Cottus aleuticus (iilbert. 



Ninety-nine specimens 3 to 4 inches long collected by Mr. Rutterin Lake Karluk during the summer 



of 1903. 



Head 3.75 to 3.85 in length; eye 5 in head; dorsal ix, 19; anal L2 or 13; pectoral 15, 



The collection contains also 3 specimens 4 to 4.5 inches long from a small stream at the head of the 



flume at the Loring cannery. July 26; 4 specimens 2.75 to 3.25 inches long from the stream at the Fort- 



mann hatchery, July 7. taken on hook and line; and 2 specimens 2.75 to 3.75 inches long from Steelhead 



Creek near Loring, May l 



Fig. 65.— Cottus aleuticus Gilbert. 



The Karluk specimens show quite a different color pattern from those taken at Loring, the body 

 being much darker and plainer, with very little vermiculation or marbling; the fins sometimes marbled 

 with dark; the spinous dorsal sometimes plain with very small dark punctulations, or the upper half 

 of fin black, edged with white, these punctulations sometimes found on soft dorsal and anal. Many of 

 these specimens have tubercles on ventral and pectoral fins, those on the ventrals sometimes arranged in 

 patches. 



The lateral line is not always complete, does not drop abruptly at end of soft dorsal, but ends there 

 in some specimens, generally those with plain soft dorsal. 



This species has been recorded by Bean (1882) as Uranidia microstoma, from Indian River. Sitka; 

 St. Paul, Kodiak Island; Aleutian Islands; Iliuliuk, Unalaska. Gilbert (1895) from Iliuliuk, Unalaska. 

 Rutter (1899), Karluk River and Lake and in Alitak Lake. Nelson (1887). mouth of Tanana River. 



131. Cottus chamberlaini Evermann A (ioldsborough, new species. 



Head 3 in body; depth 4.3; eye 3.75 in head; snout 3.9; maxillary 2.5; interorbital space 5 in eye; 

 dorsal rx-16, longest spine 3.3 in head, the longest ray 2.3; anal 11, longest ray 2 in head; pectoral 14, 

 the length equal to that of head; ventral i, 4, the length 1.6 in head; branchiostegals 6. 



Body fusiform, tapering rather rapidly from the heavy head to the long slender caudal peduncle, 

 the body usually considerably constricted at the vertical connecting origins of anal and soft dorsal; 

 head rather large; snout short; mouth moderate, low, nearly horizontal, the maxillary scarcely reaching 

 front of pupil; a small patch of teeth on vomer, palatines naked; eyes large, high up and close together; 

 interorbital space very narrow; anterior nostril in a very distinct tube; posterior nostril in an evident 

 tube, which is shorter than that of the anterior; head entirely smooth, without cirri or spines except 

 those on opercular bones; preopercle with one simple sharp spine at the angle, projecting backward 

 and curved upward somewhat : edge of preopercle below this smooth or merely erenulate; opercle ending 

 in a soft flap, subopercle with a rather distinct blunt spine projecting downward; body entirely smooth, 

 except a small patch of asperities under the pectoral; lateral line complete or nearly so, Fins moderate; 

 interval between spinous and soil dorsal short, but distinct; origin of spinous dorsal posterior to base 

 of pectoral a distance equal to one-third diameter of eye; origin of anal slightly posterior to thai of soft 

 dorsal caudal slight 1\ -rounded : pectoral long, reaching origin of anal; ventrals short, not reaching vent. 



